content: /*
  Copyright 2006 Jerry Huxtable
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
     http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  */
  
  package com.jhlabs.vecmath;
  
  /**
   * Vector math package, converted to look similar to javax.vecmath.
   */
  public class Vector3f extends Tuple3f {
  
  	public Vector3f() {
  		this( 0, 0, 0 );
  	}
  	
  	public Vector3f( float[] x ) {
  		this.x = x[0];
  		this.y = x[1];
  		this.z = x[2];
  	}
  
  	public Vector3f( float x, float y, float z ) {
  		this.x = x;
  		this.y = y;
  		this.z = z;
  	}
  
  	public Vector3f( Vector3f t ) {
  		this.x = t.x;
  		this.y = t.y;
  		this.z = t.z;
  	}
  
  	public Vector3f( Tuple3f t ) {
  		this.x = t.x;
  		this.y = t.y;
  		this.z = t.z;
  	}
  
  	public float angle( Vector3f v ) {
  		return (float)Math.acos( dot(v) / (length()*v.length()) );
  	}
  
  	public float dot( Vector3f v ) {
  		return v.x * x + v.y * y + v.z * z;
  	}
  
  	public void cross( Vector3f v1, Vector3f v2 ) {
  		x = v1.y * v2.z - v1.z * v2.y;
  		y = v1.z * v2.x - v1.x * v2.z;
  		z = v1.x * v2.y - v1.y * v2.x;
  	}
  
  	public float length() {
  		return (float)Math.sqrt( x*x+y*y+z*z );
  	}
  
  	public void normalize() {
  		float d = 1.0f/(float)Math.sqrt( x*x+y*y+z*z );
  		x *= d;
  		y *= d;
  		z *= d;
  	}
  
  }
  